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1. MC-12 Study Guide > Fuel System > Flashcards

Fuel System Flashcards

1
Q

Describe the fuel system

A

Two separate, but identical fuel systems connected by a valve controlled cross feed line. The MC-12 is capable of carrying 775 gallons of JP8 in three different sets fuel tanks

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2
Q

The fuel system consists of the following subsystems:

A

Storage Systems (Tanks, Vents, Drains & Indicators) Distribution Systems (Fuel Pumps, Valves, & Fuel Control)

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3
Q

What are the fuel capacities for each of the separate fuel tanks.

A

Wing Tank = 190 Usable Gallons

136 Wing

54 Nacelle

Auxiliary Tank = 79.5 Usable Gallons

ER Tank = 118 Usable Gallons

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4
Q

Do not put any fuel into the _____ tanks unless the ______ tanks are full and no fuel in the ______ unless the ______ are full.

A

Do not put any fuel into the auxiliary tanks unless the main tanks are full and no fuel in the ER unless the AUXs are full.

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5
Q

How many vents are located on the underside of the wing adjacent to the nacelle?

A
  1. Each serves a backup to the other if one becomes blocked.
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6
Q

What is the purpose of the fuel vent system?

A

Keeps positive pressure in the main tanks to allow gravity feed.

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7
Q

What happens when fuel expands due to heat?

A

If the main tank is full, and the aux tank if empty, fuel vents into the aux.

If both tanks are full, the fuel vents down the leading edge and through the heated fuel vent.

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8
Q

What is the fuel capacity of the Nacelle Tank?

A

54 gallons

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9
Q

What can happen if the fuel vents become clogged?

A

Fuel can become trapped in the system causing an early flame-out.

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10
Q

If fuel remains in the auxiliary tank and the NO FUEL XFR annunciator stays illuminated, What is happening and what are your actions?

A

This indicates that the motive flow valve is still closed. Place the XFR OVERRIDE switch to AUX.

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11
Q

L/R FUEL QTY illuminates indicating what?

A

Approx 30 minutes (45 gallons) of fuel remaining per engine at maximum continuous power.

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12
Q

The Jet Pump in the ER and Aux Tanks are:

a. Mechanical
b. Electric
c. Bleed air driven
d. Operating when fuel flows through it.

A

d. Operating when fuel flows through them.

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13
Q

The Auxiliary fuel transfer system is fully ________ and is only __________ by the pilot.

A

The Auxiliary fuel transfer system is fully automatic and is only monitored by the pilot.

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14
Q

What is the consideration concerning Manual Transfer Override with the ER system?

A

The pilot must place the switch back into AUTO or AUX when the ER Tank is empty.

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15
Q

Engine Driven Boost Pump is how many psi?

What does it share with the oil pump?

A

30 psi

Shares the same drive shaft as the oil pumps

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16
Q

What is this?

A

Engine Driven Boost Pump

(Low Pressure 25-30psi)

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17
Q

What is this?

A

Engine Driven Fuel Pump

900-1100 (High Pressure)

Failure of the high Pressure Pump results in engine flameout

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18
Q

What is the purpose of the Oil-to-Fuel Heat Exchanger?

A

Used to heat fuel and vaporize water crystals to prevent fuel filter blockage inside the fuel control.

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19
Q

I am a drop of fuel. What is my path from the tanks to the engine?

A
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20
Q

How many fuel pumps are there on each side of the aircraft?

A

5

Engine Driven Boost Pump

Standby Boost Pump

High Pressure Pump

Jet Transfer Pump (ER)

Jet Transfer Pump (AUX)

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21
Q

Which sequence of components correctly defines the flow of the fuel from the Firewall Shutoff Valve to the Fuel Manifold?

A

Engine Driven Boost Pump, Fuel Filter, Oil-to-Fuel Heat Exchanger - High Pressure Pump - Fuel Control Unit - Fuel Flow Transmitter

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22
Q

How many fuel nozzles are there on the engine?

Are they simplex or dualplex?

A

14 simplex

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23
Q

Which component in the fuel system shares the same drive shaft as the oil scavenge pumps?

A

Engine Driven Boost Pump

  • If the Engine Boost Pump fails, the oil scavenge pump may also be affected.
24
Q

What happens during crossfeed operations?

A
  1. CROSSFEED light illuminates.
  2. Crossfeed Valve opens
  3. STBY Pump on supply side energizes.
  4. Motive flow valve on receiving side closes
25
Q

The Left or Right FUEL PRESS warning light is designed to tell you when:

A

The Engine Driven Fuel Boost Pump has failed.

26
Q

What does the fuel ER/AUX XFR override switch do?

A

Provides electrical power directly to the respective motive flow valve.

27
Q

How long can you operate with the red FUEL PRESS warning light illuminated?

A

10 hours

28
Q

If the High Pressure Pump fails, what will happen?

A

The engine will fail.

29
Q

What is the maximum fuel imbalance?

A

300 lbs.

30
Q

The minimum fuel required for takeoff is how many pounds?

A

265 lbs in the main tanks.

31
Q

How many Standby Pumps are required for takeoff?

A

One STANDBY PUMP can be inoperative for takeoff.

32
Q

What limitations are placed on operations with AVGAS?

A

Limited to 150 hours between overhauls.

  1. Operation is limited to 150 hours between engine overhauls.
  2. Operation is prohibited if either standby fuel pump is inoperative.
  3. Crossfeed capability is required for flight above 20,000 feet pressure altitude

(FL200).

33
Q

Which fuel pump is the high pressure pump?

A

Engine Driven Fuel Pump Mounted in conjunction with the Fuel control unit.

34
Q

What effect does the turning on the Standby fuel pump have on a FUEL PRES LO Warning Light?

A

It should extinguish the light.

35
Q

What is the sequence of fuel transfer and consumption of the MC-12?

A
36
Q

Which fuel pump is the most critical?

A

Engine Driven Fuel Pump, if this pump fails there will be an immediate flame-out of the engine; this is the only high pressure pump.

37
Q

Are there any Warning Segment lights associated with failure of the primary boost pump?

A

Yes, a corresponding (L or R) FUEL PRES LOW.

38
Q

With all tanks full, and the XFR OVERRIDE Switch in the AUTO position, what pilot action is required for access to all the fuel in all tanks?

A
39
Q

What effect does the ignition system have on the fuel system?

A

When the IGNITION is ON, fuel will not transfer from either the AUX Tank or the ER Tank.

40
Q

What happens when the XFR OVERIDE switch is placed in the ER position?

A

The automatic fuel transfer logic incorporated with the ER tank is bypassed.

41
Q

What does illumination of the (L or R) NO FUEL XFR light mean?

A
42
Q

Is Crossfeed of fuel permitted with 2 engines operating?

A

No - cross feeding of fuel is permitted only when one engine is inoperative.

43
Q

With a (L or R) FUEL PRES LOW Caution Light illuminated, aside from executing the Emergency Procedure, what else should the pilot do?

A

Record the time, to ascertain the time the engine ran. Operation of either engine with its corresponding fuel pressure annunciator (L FUEL PRES LO or R FUEL PRES LO) illuminated is limited to 10 hours before overhaul or replacement of the engine-driven fuel pump.

44
Q

What could happen If fuel vents become clogged:

A
45
Q

Question: the Jet Pump in the ER and AUX Tanks are:

a. Mechanical
b. Electric
c. Bleed Air Driven
d. Operating when fuel flows through it.

A

Answer: D. Operating when Fuel flows through it.

46
Q

Q: The Auxiliary fuel transfer system is fully ________ and is only __________ by the pilot.

A

A: The Auxiliary fuel transfer system is fully automatic and is only monitoredby the pilot.

47
Q

Q: What is the consideration concerning Manual Transfer Override with the ER system?

A

A: The pilot must place the switch back into AUTO or AUX when the ER Tank is empty.

48
Q

Q: How many fuel pumps are there on each side of the aircraft?

A
49
Q

Q: Which sequence of components correctly defines the flow of the fuel from the Firewall Shutoff Valve to the Fuel Manifold?

A

A: Engine Driven Boost Pump, Fuel Filter, Oil-to-Fuel Heat Exchanger - High Pressure Pump - Fuel Control Unit - Fuel Flow Transmitter

50
Q

Q: How many fuel nozzles are there on the engine?

Q: Are they simplex or dualplex?

A

Q: How many fuel nozzles are there on the engine?

A: 14

Q: Are they simplex or dualplex?

A: Simplex

51
Q

Q: Which component in the fuel system shares the same drive shaft as the oil scavenge pumps?

A
52
Q

Q: What is the purpose of the Oil-to-Fuel Heat Exchanger.

A

A: The Oil-to-Fuel Heat Exchanger allows hot oil into the unit when the fuel temperature is too cold.

  • To prevent the formation of ice crystals that could potentially clog the fuel control unit.
53
Q

Q: What does the fuel ER/AUX XFR override switch do?

A
54
Q

Q: What four things happen when the FUEL CROSSFEED switch is activated?

A
  1. Fuel Crossfeed light illuminates
  2. Crossfeed valve opens
  3. Supply side standby boost pump turns on.
  4. Receiving side motive flow valve closes
55
Q

Q: How many Standby Pumps are required for takeoff?

A

A: One STANDBY PUMP can be inoperative for takeoff.

1. MC-12 Study Guide (16 decks)

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